Improvement in valves for stop-cocks



UNITED PATENT OFFICE.

Z. ERASTUS COFFIN, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN VALVES FOR STOP-COCKS.

Specification forming part of Letters Patent No. 64,199, dated April 30, 1867.

To all whom it may concern:

Beit known that I, Z. ERASTUS OOFFIN, of Newton, in the county of Middlesex and State of Massachusetts, and Boston, in the county of Suffolk and State aforesaid, have invented certain Improvements in Valves of StopGoclrs for Water-Pipes5 and I do hereby declare that the followingl is a full and exact description thereof, reference being had to the accompanying drawings, forming a part of this specifcation, and to the letters of reference marked thereon.

With reference to these drawings, Figure 1 is asectional view, the section being taken through the center of the valve-rod. Fig. 2 is a section transverse to the rst, taken through the induction and eductioii nozzles and the valve.

Like letters refer to the same or corresponding parts in all the drawings.

a a are the induction and eduction nozzles or pipes. b b are the valve-seats. c c is the valve, made up of two parts. d is the valvestem. c is a chamber, into which the valve is drawn when the water-way is open. The two parts of the valve bearing the faces f, which close upon the seats b, as shown in the drawings, are hinged to each other or the valvestem, so as to be free to adjust themselves to the angles of the seats b. The drawing shows one method of doing this, in which ears are cast on the two sections of the valve, and a pin is put through them and the valve-stem. Other methods of securing the two parts so that they shall be free to adjust themselves to the angles of the seats will readily suggest themselves to the artisan. Another peculiarity in this valve is, that its stem or connection for moving it, which may be a screw, lever, or other means, is allowed a slight movement independent of the valve, so that when the valve is seated, a part, as g, may be forced like a wedge between the two sections of the valve. The effect of this is, that on reversing the movement, the part g being made to move slightly, or enough for the purpose, before the valve moves in opening, the pressure upon the seat is relieved thereby, so that it opens with much less friction than it would without this provision. Onemethod otdoingthis is shownviz., enlarging the holeA for pin h, by which the valve is jointed or pivoted to the stem or other mover d. Other methods of securing this slight separate movement of the mover of the valve so as to secure this effect will readily suggest themselves to the artisan. The other points in the construction of the stop-cock, as well as the material to be used, are not essentially different from other cocks, and will need no further description.

Having therefore described my improvement, what I claim as my invention, and desire to secure by Letters Patent, is as follows:

1. The valve made in two parts, each bearing a face, and so jointed with reference to each other and to the mover as to render them self-adjusting to the angles of the seats, substantially as described.

2. Giving the mover a movement independent of the movement of the valve, so as to relieve the pressure by means substantially as described.

Z. E. GOFFIN.

Witnesses:

EDWARD REED, D. N. B. Comun, Jr. 

